By help from answers given thru my request of, why my 915 transmission leaked fluid, a suggestion from a patron of the Pelican Parts forum, suggesting the 'Top Breather Vent' may be oriented incorrectly.
It was suggested the vent opening be positioned forward at 2:00 o-clock.
Checking mine, it was not. I re-oriented it as suggested and discovered no leaking from the transmission after a short drive.
Better proof in the spring when the car can be driven a greater distance.